armpit
armpit
noun
/ˈɑːmpɪt/
(also North American English, informal
pit
)
the part of the body under the arm where it joins the shoulder
see also
underarm
Topics Body
C2
Idioms
the armpit of something
e.g.
From your position... its heart is right below the armpit. その位置からだと 心臓はわきの下だ (
/yupeco/『ゴールデンカムイ』
2話)